Tinosorb S (Bemotrizinol)

Tinosorb S (bis-ethylhexyloxyphenol methoxyphenyl triazine, bemotrizinol) is the most advanced organic UV filter in widespread use: it absorbs across UVB and deep into UVA-I to ~400 nm, is exceptionally photostable (it even stabilises avobenzone), and has one of the lowest photocontact-allergy rates of any filter. Its large molecular size keeps it on the skin surface rather than absorbing into the body. Approved in the EU since 2004, it anchors premium European and Asian sunscreens at up to 10%. For users prioritising maximum broad-spectrum protection with minimal irritation risk, Tinosorb S-based formulas are the current gold standard.